I want to learn photoshop, illustrator etc, but as of yet am settling for the cheaper (free) GIMP program to learn some basics. SO much harder then I thought!
I decided to follow a tutorial on how to colour a black and white sketch, it took so much playing around with many layers and trying to work out how the layers work together.
Its very messy, but its a start (has to improve, as can't get worse!)
In the end, used a GIMP tool too emboss the image as well (hides the terrible colouring)